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LC //e Card - Problematic Software

Nearly all software that doesn't work on the Apple //e Card for Macintosh LC is likely because of accesses to $C029. This location is the NEWVIDEO register on the Apple IIgs which is used for, among other things, turning on and off super hi-res graphics modes.

TN.MISC.15 cautions against using this location without first identifying the machine. Ironically, the document is mistaken as to the outcome on the IIc Plus, and doesn't mention the //e Card at all.

On the //e Card, accessing $C029 switches out the main firmware in favor of the active alternate firmware bank. A subsequent attempted use of common firmware routines will not go well.

Bitsy Bye

Bitsy Bye, as included with ProDOS 2.4.0 and 2.4.1, accidentally access $C029, switching out the main ROM bank. This causes a crash when it tries to use a firmware routine.